Junebug + external power source

UTMonkey

Member

• May 2, 2008

• #1

Hi All,

I am pretty certain this has been asked before but I cannot find the post.

The last few of my projects are breadboard based using the Junebug to program and debug, what would happen if I attach an external 5 volts to the breadboard power rails whilst having 5V supplied from the Junebug?

Would I need to detach the 5V line from the Junebug?

Regards

Mark

 

blueroomelectronics

Well-Known Member

• May 2, 2008

• #2

Nope, you might get some trickle current from your targets 5V supply but it won't hurt the Junebug. The 1N5817 diode on the Junebug is designed to block external DC(the +5V ICD pin) from powering the Junebug.

 

UTMonkey

Member

• May 2, 2008

• #3

Great thanks.

 

UTMonkey

Member

• May 3, 2008

• #4

Just thinking though, wouldnt 5V from the junebug and the 5V provided via the breadboard source equal 10V = (KVL)? or is it 5V parallel?

my electronics theory is very shaky....

 

binzer

Member

• May 3, 2008

• #5

UTMonkey said:

Just thinking though, wouldnt 5V from the junebug and the 5V provided via the breadboard source equal 10V = (KVL)? or is it 5V parallel?
my electronics theory is very shaky....

Click to expand...

It would be in parallel with the existing 5v source, like Bill said there is a blocking diode to eliminate back feeding to the Junebug.

 

Kryten

New Member

• May 3, 2008

• #6

And they have the same ground referance